Here is a little update to my Fluke PM6681 counter.
Refernce:
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg2871844/#msg2871844Yesterday, the GPSDO (BG7TBL 2019-08-09) arrived and today I've installed the GPS antenna.
The GPSDO locked to the GPS signal after 2 or 3 minutes and after 20 minutes the internal OCXO
synced to the GPS signal. Now I have a 10MHz signal with an uncertainty of 1*10
-11I've connected it to the PM6681 as an external reference and adjusted the new OCXO for the Fluke PM6681 which is much stabler (around a factor of 1000) than the internal oscillator.
This is the OCXO. I just bodged a little thermometer to it to see, when the oven temperature stabilises.
Interestingly, the temperature drifts between 44.8°C and 46°C but by the looks, this doesn't affect the stability of the 10MHz.
This is the state after 1.5h cooking:
![](https://i.imgur.com/Gb2Xqri.jpg)
Edit:
I've also received the prescaler from cojotech (Thank you very much!
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)
)
I'll put everything together by tomorrow and will do a little follow-up then here.
Regarding the discord session: I'll try to join, but since some relatives wants to visit us tomorrow I have promised to bake two cakes. So, perhaps I'm a bit busy besides discord.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/xwink.gif.pagespeed.ic.cldandycH0.png)